Replace the full-viewport .wizard rule with a fixed-inset frosted-glass card
(backdrop-filter blur, semi-transparent surface, rounded corners, inset shadow)
so the Mercury void/gradient wall shows behind and around the card. Adds
@keyframes sm-rise entrance animation and a body::after SILVERMETAL wordmark
watermark on the wall. Targets the real .wizard class in SilverOS.Welcome.UI/
Components/Routes.razor — no App-project markup touched.
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